Hello~ ㄴㅅㅈ-nim!!! That's right ㅎㅎㅎ This course is designed for those who have used the Java language for about 6 months to 1 year!! Therefore, we are also planning a free intermediate Java course to help you better understand the Kotlin course you have seen within a year!! We will come back with a more advanced version~ Thank you for your valuable feedback!!! :)